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Location:
Sydney
Registered:
August 2004
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Custom Intake Manifold
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Tue, 16 November 2004 14:22
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Does any one where I can get a good custom intake manifold made to flow some big numbers? I've been thinking of getting the stock RWD intake manifold for the 4AGE, but the rarity of these things, and the cost, I'm starting to wonder if I can actually fabricate a custom manifold that will actually flow better (around 20psi? I actually just stumbled across Bill's website)
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Location:
Perth
Registered:
June 2002
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Re: Custom Intake Manifold
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Tue, 16 November 2004 15:29
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Not sure what you mean when you say "Flow 20 Psi" but anyway....
When fabricating an intake manifold it may pay to build your manifold around the specs of the factory item. Specifically runner length and plenum volume and port sizing, unless of course you are planning to play heavily with cams and big turbochargers etc....
Reason being that Toyota have engineered the factory item and matched it to a specific engine with specific cam specs, and whether or not the engine is subject to forced induction and the like.
As far as pointers go, there is plenty here that a search will uncover, and I cant help you with a place to make one for you as I do all my fabrication work myself.
Cheers
Gabe
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Location:
Sydney
Registered:
August 2004
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Re: Custom Intake Manifold
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Tue, 16 November 2004 15:42
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Hi Gabe, thanks for the reply, but is the length of the runner really that important? As I've seen custom intake manifold with real short runners for the 4AGTE conversion, also I've seen people cut short the original 4AGE intake manifold so as to clear the bonnet, I've searched through yahoo and couldn't find much, so maybe I'll look in the phone book tomorrow..
Also, what do you think about the below?
http://www.hotengines.com.au/manifold_modfication. html
their intake manifold seem to look "square" and not rounded as in the factory 4AGE, do they flow less?
How much time and money would it cost you to fabricate a custom say 4AGE intake manifold?
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Location:
Perth
Registered:
November 2004
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Re: Custom Intake Manifold
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Wed, 17 November 2004 03:39
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I'm no expert, but from what I have heard and read, you need to build the runners to the torque characteristics of the engine.
"US based engineering guru David Vizard suggests that a runner length of seven inches at 10,000rpm makes a good starting point. (Note that runner length is the distance from the plenum chamber right to the intake valve seat.)
Add to this another 1.7inches for each 1000rpm less than that which the system is being tuned for. Tuning for peak torque (not peak power) is the norm, so if the engine were being tuned for 4000rpm, a runner length of 17.1 inches (43.6cm) would be required."
-Julian Edgar, 2000 21st Century Performance
I ripped this from this thread which is worth a read....
http://forums.toymods.org.au/index.php?t=msg&t h=30397&rid=8258&S=75b68124fe687e3d107f17d 5fe7df261&pl_view=&start=0#msg_266989
It is not always practical to have huge long runners but if you look at the factory designs, they are not far from it.
As far as flowing well, its not always possible to "see" what flows well, though usually you can get a rough idea on if the manifold is restrictive or not.
I can make you a manifold, I have for a few others, not specifically a 4AG but the principals are the same. If you're not in a huge rush, PM me and we might be able to work something out
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Location:
Sydney
Registered:
August 2004
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Re: Custom Intake Manifold
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Wed, 17 November 2004 04:09
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Hi there, I'm not really in a rush at the moment, coz still using the cut and shut FWD manifold, but I was just interested to know when these FWD and RWD manifold starts restricting? And when a custom intake manifold is necessary? Since these RWD manifold are so rare!
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Location:
Canberra
Registered:
May 2002
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Re: Custom Intake Manifold
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Wed, 17 November 2004 04:13
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200rwkw doesn't seem to be a problem with the stock bigport manifold.
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Location:
Sydney
Registered:
August 2004
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Re: Custom Intake Manifold
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Wed, 17 November 2004 04:20
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TE72_Turbo: so I assume that's what you've got? But what's the chance of finding one for a reasonable price? 
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Location:
Canberra
Registered:
May 2002
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Re: Custom Intake Manifold
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Wed, 17 November 2004 04:26
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Yes, I have the RWD inlet manifold on mine, but it shouldn't be any better than a cut and shut FWD one, they have the same runners, just the throttle body is placed differently isn't it? 
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Location:
Perth
Registered:
June 2002
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Re: Custom Intake Manifold
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Wed, 17 November 2004 04:27
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| blackjza70r wrote on Wed, 17 November 2004 11:39 |
I'm no expert, but from what I have heard and read, you need to build the runners to the torque characteristics of the engine.
"US based engineering guru David Vizard suggests that a runner length of seven inches at 10,000rpm makes a good starting point. (Note that runner length is the distance from the plenum chamber right to the intake valve seat.)
Add to this another 1.7inches for each 1000rpm less than that which the system is being tuned for. Tuning for peak torque (not peak power) is the norm, so if the engine were being tuned for 4000rpm, a runner length of 17.1 inches (43.6cm) would be required."
-Julian Edgar, 2000 21st Century Performance
I ripped this from this thread which is worth a read....
http://forums.toymods.org.au/index.php?t=msg&t h=30397&rid=8258&S=75b68124fe687e3d107f17d 5fe7df261&pl_view=&start=0#msg_266989
It is not always practical to have huge long runners but if you look at the factory designs, they are not far from it.
As far as flowing well, its not always possible to "see" what flows well, though usually you can get a rough idea on if the manifold is restrictive or not.
I can make you a manifold, I have for a few others, not specifically a 4AG but the principals are the same. If you're not in a huge rush, PM me and we might be able to work something out
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Dunno what happened here. But I wrote that!!
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Location:
Sydney
Registered:
August 2004
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Re: Custom Intake Manifold
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Wed, 17 November 2004 04:36
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reason why I'm chasing the RWD is becoz my FWD seems to sit too high?! And have clearance problems with the bonnet, and from what I've seen, the RWD manifold seems to sit much lower?
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Registered:
May 2002
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Re: Custom Intake Manifold
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Wed, 17 November 2004 04:52
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I picked up my RWD manifold with a throttle body for $80 if I remember correctly. You see them go for about $150 more commonly. They don't appear to cause any sort of restriction up to 200rwkw as has been shown on a number of occassions now.
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Location:
Sydney
Registered:
August 2004
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Re: Custom Intake Manifold
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Wed, 17 November 2004 04:56
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ke382TG: so how long ago was it when you got yours for $80?  I'll pay straight away if I see one for $80 with TB...
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Custom Intake Manifold
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Wed, 17 November 2004 07:14
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| gabe wrote on Wed, 17 November 2004 12:27 |
Dunno what happened here. But I wrote that!!
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Someone else at your work uses Toymods.
Terry I believe it is.
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Location:
Sydney
Registered:
August 2004
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Re: Custom Intake Manifold
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Wed, 17 November 2004 09:52
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if only I can find one for $80... 
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Location:
Adelaide, drift capital
Registered:
May 2004
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Re: Custom Intake Manifold
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Wed, 17 November 2004 10:06
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| 86tt wrote on Wed, 17 November 2004 15:06 |
reason why I'm chasing the RWD is becoz my FWD seems to sit too high?! And have clearance problems with the bonnet, and from what I've seen, the RWD manifold seems to sit much lower?
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I know a number of people who run cut and shut FWD intake manifolds in their ae86s. They dont seen to have any issues with bonnet clearance.
As suggested earlier, they are the same runner length ect. as the RWD?
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Location:
Sydney
Registered:
August 2004
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Re: Custom Intake Manifold
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Wed, 17 November 2004 10:15
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| Quote: |
I know a number of people who run cut and shut FWD intake manifolds in their ae86s. They dont seen to have any issues with bonnet clearance.
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that's strange.. is there different FWD manifold? Because I've even seen in a japanese ae86 page using a FWD manifold and he had to cut part of the runners off which is right under the plenum to lower the intake manifold profile...
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Location:
Adelaide, drift capital
Registered:
May 2004
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Re: Custom Intake Manifold
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Wed, 17 November 2004 10:22
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| 86tt wrote on Wed, 17 November 2004 20:45 |
| Quote: |
I know a number of people who run cut and shut FWD intake manifolds in their ae86s. They dont seen to have any issues with bonnet clearance.
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that's strange.. is there different FWD manifold? Because I've even seen in a japanese ae86 page using a FWD manifold and he had to cut part of the runners off which is right under the plenum to lower the intake manifold profile...
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Hmmm to my knowlegde they are the same length runner. However now that you meantion it, the people I know who have cut and shut intake manifolds all have smallport 4AGEs.
Can anyone confirm whether FWD bigports are identical in runner length and height as RWD bigports? I am not 100% on this.
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Location:
Sydney
Registered:
August 2004
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Re: Custom Intake Manifold
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Wed, 17 November 2004 10:44
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how does the small port & big port FWD manifold look like? They look different right?
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Location:
Adelaide, drift capital
Registered:
May 2004
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Re: Custom Intake Manifold
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Wed, 17 November 2004 11:23
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The bigport 4AGE is a little similar in size and shape (from the outside) to the smallport 4AGE. The bigport has the TVIS.
In regards to this jap ae86 with a bigport cut and shut, could you please post a pic?
For one I dont see why a jap ae86 would have a FWD 4AGE and secondly I have many doubts that this manifold would cause any bonnet clearance issues.
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Location:
Sydney
Registered:
August 2004
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Re: Custom Intake Manifold
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Wed, 17 November 2004 15:12
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yeah, you've made a good point, why the hell they have to convert a fwd manifold to rwd when they should have so many manifold anyway? here's one of the link, but I'm still trying to find the one where they had to cut the runners short...
http://www.mirai.ne.jp/~jnagai/inmani.html
I think this is the small port manifold that you've mentioned, found it on Bill's website, it looks pretty flush with the top of the engine (only slightly higher)
And this could be a big port manifold, which seems to sit much higher than the 4AGE engine?
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Location:
Sydney
Registered:
August 2004
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Registered:
February 2003
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Re: Custom Intake Manifold
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Wed, 17 November 2004 23:30
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I think that the only real clearance problem between the FWD and RWD manifolds is the slant at which the TB is. (this is shown on the first link)
as the bonnet slopes down, it runs parallel with the RWD manifold slant so you won't have as much issues where as the FWD one will have to be most probably shortened and adapted back to clear the bonnet.
86tt, so are you opting for more power? is this the reason you are after different manifold/cooler/turbo etc?
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Location:
Sydney
Registered:
August 2004
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Re: Custom Intake Manifold
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Thu, 18 November 2004 01:34
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audioslaver: I'm fine with the turbo (should be good till 300hp+), just that I've only got a 1GGTE cooler, and a hole in my bonnet, so it's 2 things that I want to get rid of... Because I'm putting the air condition back in soon, and I want to relocate the cooler a bit forward to fit the condensor, that will mean new pipings for cooler and so may as well replace the cooler if I can afford it..
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Toymods Vice President
Location:
Sydney
Registered:
May 2002
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Re: Custom Intake Manifold
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Thu, 18 November 2004 01:44
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The TVIS manifold is the big port one, the ribbed manifold is a small port.
What kind of manifold are you running at the moment?
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Location:
Adelaide, drift capital
Registered:
May 2004
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Re: Custom Intake Manifold
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Thu, 18 November 2004 02:02
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Please post some pics of your current intake manifold setup.
As meantioned, the first pic that you posted (TVIS manifold) is a bigport...with a weird looking adapter mounting the TB. The one below is a smallport.
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Location:
Sydney
Registered:
August 2004
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Re: Custom Intake Manifold
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Thu, 18 November 2004 14:06
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Joshstix/4ageeza: you two seems to be saying the opposite thing??
I have the one below with 4 big runners...
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Location:
Adelaide, drift capital
Registered:
May 2004
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Re: Custom Intake Manifold
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Thu, 18 November 2004 14:31
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By 'ribbed manifold' Joshstix is referring to the bottom 'Smallport' 4AGE. The ribs he means are the parallel ribs that run along the top of the plenum. The top pic is the 'blue-top' or 'bigport' as it is known.
For more info check out http://www.club4ag.com
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Location:
Sydney
Registered:
August 2004
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Re: Custom Intake Manifold
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Fri, 19 November 2004 03:02
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so that means I have the bottom manifold, small port manifold with a small port head...
so why does some people have clearance problem with the manifold while other's don't? They must use the same mount right?
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